Tankerman · Gauging — Closed
Closed gauging of a cargo tank is preferred over open (ullage-port) gauging because it:
- AIs faster but less accurate
- BPrevents release of cargo vapor and exposure of personnel to the tank atmosphere✓ Correct
- CRequires opening the tank to the deck
- DWorks only on inert tanks
Explanation
A closed gauging system measures level through a sealed device so the tank is not opened to atmosphere, avoiding vapor release, static risk at the ullage port, and personnel exposure to toxic or flammable vapor.
Authority: Tank Vessel Operations — Gauging
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